Product Announcement from Fargo Controls, Inc.
Fargo Controls offers inductive proximity sensors for detecting the presence of metallic objects.
Their operating principle is based on a coil and high frequency oscillator that creates a field in the close surroundings of the sensing surface. The presence of metal in the operating area causes a change in the oscillation amplitude. This change is identified by a threshold circuit, which changes the output of the sensor.
The operating distance of the sensor depends on the coil's size as well as the target's shape, size and material.